ZIP Code 61770

61770 is one of Illinois's ZIP codes, delivering to addresses in Saybrook, McLean County.

City: Saybrook
County: McLean County
State: Illinois
Prefix: 617xx

Where this code sits

61770 is part of the 617xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Saybrook.

Saybrook Illinois ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 61770 delivers to without sharing its boundary.

ZIP codes nearest 61770

The ZIP codes whose reference points sit closest to 61770.
ZIP code	Distance	Delivers to
ZIP code 61722	5.7 mi	Arrowsmith, IL
ZIP code 61724	6.4 mi	Bellflower, IL
ZIP code 61845	7.6 mi	Foosland, IL
ZIP code 61720	7.7 mi	Anchor, IL
ZIP code 60936	8.9 mi	Gibson City, IL
ZIP code 61728	11 mi	Colfax, IL
ZIP code 61737	11 mi	Ellsworth, IL
ZIP code 61731	12 mi	Cropsey, IL

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 61770, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 61770. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.